The wormohole solution found in [1]}, by following the approach of [2]}, readsNote that the coordinates \((t, \xi , \theta , \phi )\)  used here are not the Schwarzschild coordinates since, \(\xi \)  is not the curvature radius of a coordinate sphere \(\xi =\) const\(>0\) .
\(ds^2=-f(\xi )dt^2+g(\xi )d\xi ^2+(\xi ^2+a^2)(d\theta ^2+\sin ^2\theta d\varphi ^2)~.\) 
